Valve



LSGSJB N. DE VITO May SS.,

VALVE Filed Sept. 27, 192B mm M E y O www/Mw f/ M@ O Patented May 12, 1931' NICHOLAS DE VTO, OF ST. LG'UIS, MISSOURI 'VALVE Application led September 27, 1928. Serial No. 3087667.

The object of my invention is to make a valve to be used in steam or fluid lines; one that does not require packing to make and keep it tight. A further object is to make a valve in which the contact between the valve stem seat and the steam nut will be metal on metal forming a ground joint. By use of the valve the rotation of the valve stem seat in the steam nut will make the joint tighter.

A still further object is to make a valve in which the valve stem will not be raised or lowered with the raising or lowering of the plug in or out of the seat. rl`his is an advantage because it enables the valve to be placed in a smaller space than is the case with the conventional valve.

Another object of the packless self grinding stein is that being self grinding it is perpetually leak proof and notV only eliminates the conventional sott packing which must be replaced at intervals, but eliminates the inconvenience and damage due to steam or liquid leaking. This latter is a big factor because in practice after a leaking valve is discovered, it requires the snutting down ot the plant or line by another valve in order to repair the leak in the valve.

A further obj ect is to construct a valve that will stand abuse in practice and will not be made to leak by a sudden jar o-r jolt such as a hammer blow or a man standing on the stem.

My valve may be made of few and simple parts that lend themselves readily to multiple production and may be easily assembled and put in place. With these and other objects in view my invention has relation to certain novel features of construction and arrangement of parts as will be hereinafter more fully described, pointed out in the claim and illustrated in the drawings in which Fig. l illustrates a section of pipe with my valve attached. F ig. 2 designatesa longitudinal sectional elevation of my valve and F ig. 3 a sectional plan view on the line 3-3 of l? ig. 2.

ln the drawings a globe valve is shown, but my invention may be applied equally as well to a gate valve. Numeral il designates the conventional body of a globe valve, having the valve seat 5. Numeral 6 designates the conventional plug, which is seated in the valve seat 5 the plug 6 is attached to the aux iliary stein 7, by means of having the circular toot 8 in sliding engagement in the slot 9, in the plug 6; the pin 10 prevents the disengagement of the auxiliary stein 7 from the plug 6. rllhis engagement between the auX- iliary stem 7 and the plug 6 permits a slight relative movement, which enables the plug 6 6o centralize itseli1 when being seated. The auxiliary stein l is threaded with the threads 1l. rlhe auxiliary stein 7 is hollow, the hole being` rectangular in cross section. N umeral l2 designates a bonnet having the ine5 ternal annular flange 13 and internally threaded below this flange with the threads and having the external annular flange 15 together with the beveled face 16 formed iear its lower end. Numeral 1l' designates i0 external threads on the upper portion of the bonnet 12 above the internal annular flange 13. Numeral 18 designates a nut, having the internal threads 19 and the internal annular lange 20. Numeral 2l designates the exterl@ nal threads on the wall surrounding valve opening of the body 4. The nut 18 is used as the means of jointure between the bonnet l2 and the valve opening of the body. rl`he hollow nut 18 is slipped over the bonnet 12 530 until the inner face of the internal annular llange 2O rests on the external annular flange 15. The internal threads 19 of the nut 1S will then come in engagement with the threads 2l on the wall surrounding valve opening of the body fl. The nut 18 is then screwed down until it assumes the position shown in Fig. 2. Numeral 22 designates the valve stem having the handle 23 secured thereto, by means of the nut 24C. The cross 99 section of the lower end of the valve stein 22 is rectangular as shown at 25. The rectangular portion of the valve stein 22 is of such size and shape as to easily slip into the rectangular hole in the upper portion oit' the auX- 95 iliary stein 8. The valve stem 22 has the reinforced section 26, which is' slightly larger in diameter than the portion between it and the handle 23. At the lower portion of the reinforcedsection 26 Ais formed the ground seat 27, which is an annular beveled surface. Numeral 28 designates a smali longitudinal section extending downwardly from l the ground seat 27. Numeral 29 designates a spring, which envelopes the portion 30 of the valve stem 22 and rests on the internal annular flange'l of the bonnet 12. Numeral 3 designates washer placed on the valve stem 22 immediately beneath the stem portion 28 and above the spring 29. Numeral. 3Q designates a ground sea steam nut, which has the lower enlarged internally threadedY section 83, and a smailer upper section 3%. eneath section is the inclined surface The gmund seat steam nut 32 forms the juncture or heiniA means ofthe valve stein 22 of the bonnet- 1Q. The lov-:er section oi' the ground se ieeam nut 32 is in threaded enga gement vf the external thread 17 of the bonnet l2, which places the inclined face 35 in contact .vith the greunc seat 9,7 of the ground seat steam nut 3ro. i The smaller upper section Zilliof the ground seat steam nut 32, as previously indicated'is hollow and of such size as to be in rotativeiy frictional en gagement with the reinforced section 2G, of the valve stem22. The ground seat 35 of the Y ground seat steam nut 3Q together with the inclined surface 27 of the valve stem 22 term Y the steam tight'joint between the valve stem 2Q and the ground seat steam nut 32. be seen that when the valve stem 22 is turned by means of the handle 23, that the auxiliary stem 7 will be turned in the bonnet l2 and that, therefore, the plug 6, will be moved vertically in and out of engagement with the valve seat 5. It is to be observed that inthis process the valve stem 22 is not moved longitudinally relative the valve.

The non-leaking properties of the valve stem depend upon the exact grinding and litting of the ground seat 35 and the inclined surface 27. In order to prevent this surface from wearing irregularities it is necessary that dirt and other foreign substances not be brought between the two surfaces. This can only be accomplished by preventing the steam or liquid from coming in contact with these surfaces, and this in turn can only be accomplished by having the two surfaces in positive contact Ywith each other. This is accomplished by the tension of the spring 29. The valve will function without the spring i9, but in that event the ground surface 35, indicated, would not always be in Contact and would wear irregularities for the reasons indicated and eventually cause a leak.

W'hat l claim and mean to secure by Letters Patent is A valve having a body portion and a valve seat formed in the body portion of said valve, a plug for selective engagement in the valve seat of the bodyA portion of said valve, an auit iliary stem, said plug secured to said stem, a bonnet, said auxiliary stem secured in said It will Y bonnet, a nut, said nut securing said bonnettothe body portion of said valve, a valve stem having one end in sliding engagement in a rectangular hole in said auxiliary stem, an annular beveled ground seat formed on said valve stem, a ground seat steam nut in rotative contact with a cylindrical portion of said valve stem and securing` the valve stem in operative posit-ion relative said bonnet, an annular beveled ground seat formed in said ground seat steam nut, the ground seats of said valve stem and said ground seat steam nut held together in sliding engagement by a spring enveloping said valve stem, resting at one end on an internal annular liange formed in said bonnet and in contact with a YYwasher at its other end, which washer is in Contact with a section of said valve stem.

In testimony whereof I ailix my signature,

NICHOLAS DE VITO.

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